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United States Patent Office.

WILLIAM SHARP, OF BURDETT, NEW YORK. IMPROVEMENT IN 
CARRIAGE-SPRINGS.

Specification forming part of Letters Patent No. 682, dated April 
7, 1838.

To all whom it may concern:

Be it known that I, William Sharp, of Burdett, in the county of 
Tompkins and State of New York, have invented a new and Improved 
Mode of Making Springs for Carriages; and I do hereby declare 
that the following is a full and exact description of the same, 
reference being had to the annexed drawings of the same, making 
part of this specification.

The nature of my invention consists in preventing the sudden 
collapse of the common elliptic spring by the inverse point 
giving elasticity to the outer elliptics, thereby rendering them 
less liable to bend or break.

To enable others skilled in the art to make and use my invention, 
I will proceed to describe its construction and operation.

I construct a spring three feet long by taking a piece of steel 
A, Fig. 1, five feet eight inches long, and making a hole one 
inch from the ends of each. I then bend them one foot two inches 
from the ends, each toward the center, shutting the points either 
close together or by leaving a circle of one inch diameter at the 
ends, in which case it requires more length of steel, leaving the 
inner points four inches from the outer part, which must be bent 
in the form of an ellipsis. Thus one half of the spring is 
formed. I then make the other pact B in the same manner, and then 
either bolt or rivet the inverted points C together. Thus the 
spring is formed, the rule to be varied according to the length 
of the spring required. In order to double the strength required, 
I propose, also, to make an inside spring D, Fig. 3, in the same 
manner as the other, only shorter and smaller, so as to operate 
on the inside of the other, being fastened by a bolt or rivet to 
the outer parts in the centers of the ellipses at E. I likewise 
propose to make the spring, as represented in Fig. 2, with stays 
G resting against the inverted ends of the spring to strengthen 
the outer parts a and b.

What I claim as my invention, and desire to secure by Letters 
Patent, is—

Bending inward the ends of the elliptical springs in the manner 
and for the purpose herein described, and also the inside stays 
and springs represented at Figs. 2 and 3 of the accompanying 
drawings, in combination as above.

WILLIAM SHARP.

Witnesses: David Kimble, Eli R. Wright.